<html lang="en" xmlns:th="http://www.thymeleaf.org">
    <head>
        <meta charset="UTF-8">
        <title>Hello</title>
    </head>
    <body>
    <a th:if="${flag == 'yes'}" th:href="@{http://www.ktjiao.com/}">ktjiaoyu</a><br/>
    <a th:unless="${flag == 'no'}" th:href="@{http://www.czkt.com/}">czkt</a>
    </body>
</html>